Conductance fluctuations in graphene in the presence of long-range disorder

Bobo Liu, Richard Akis, David K. Ferry, Girish Bohra, Ratchanok Somphonsane, Harihara Ramamoorthy, Jonathan P. Bird

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

The fluctuations in the conductance of graphene that arise from a long-range disorder potential induced by random impurities are investigated with an atomic tight-binding lattice. The screened impurities lead to a slow variation of the background potential and this varies the overall potential landscape as the Fermi energy or an applied magnetic field is varied. As a result, the phase interference varies randomly and leads to fluctuations in the conductance. Recently, experiments have shown that an applied magnetic field produces a remarkable reduction in the amplitude of these conductance fluctuations. We find qualitative agreement with these experiments, and it appears that the reduction in magnetic field of the fluctuations arises from a field induced smoothing of the conductance landscape.

Original languageEnglish (US)
Article number135302
JournalJournal of Physics Condensed Matter
Volume28
Issue number13
DOIs
StatePublished - Mar 4 2016

Keywords

  • conductance
  • fluctuations
  • grapheme
  • transport

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

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    Liu, B., Akis, R., Ferry, D. K., Bohra, G., Somphonsane, R., Ramamoorthy, H., & Bird, J. P. (2016). Conductance fluctuations in graphene in the presence of long-range disorder. Journal of Physics Condensed Matter, 28(13), [135302]. https://doi.org/10.1088/0953-8984/28/13/135302